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internal osc mode and serial comm

 
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davie22
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internal osc mode and serial comm
PostPosted: Sat Jun 10, 2006 4:24 pm     Reply with quote
I'm using 16F88 and I can't get serial com to work with 8mhz internal osc. I used the same chip with a 4mhz crystal and it works but not with intr. osc.

Could the internal osc frequency have to big of an error for serial comm to work?
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Sat Jun 10, 2006 9:23 pm     Reply with quote
According to the 16F88 data sheet, the maximum error for the
internal oscillator is +/- 2%, at 25 degrees C. So it should work
OK at room temperature. I tested the following program and
it worked OK. This program echoes back every key that you type.
Code:

#include <16F88.H>
#fuses INTRC_IO, NOWDT, NOPROTECT, BROWNOUT, PUT, NOLVP
#use delay(clock=8000000)
#use rs232(baud=9600, xmit=PIN_B5, rcv=PIN_B2, ERRORS)

//============================
void main()
{
int8 c;

while(1)
  {
   c = getc();
   putc(c);   
  }

}
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